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It's just that it's winter time (cold) and there's nowhere that I can accurately measure my 0-60 this time of year so I'm wondering what people's experience is with these mods? I mean would it shave off .2? .1? .3?

accelerating you are correct, however LSD would jump off the line a little quicker due to the face that power is going equally to both wheels, rather than one....

Lsd never distributes the power equally to both wheels. There is a certain amount of "locking" while taking a curve, so that the outer wheel gets "some" of that power, as well as the inner one. While accelerating on a straight line, it doesn't matter if you have an lsd or an open diff.

It seems like an LSD would have to help off the line. Of course you are still going to slip a wheel, but wheel slip won't be as detrimental as it would be with a Open Diff. Wheel slip with an LSD will cause the other wheel to get the rest of the torque. It seems like this would be especially true with an LSD like my Torsen (Quaife) that is auto-torque-biasing (ATB) all the time.

Yes, a ZHP does have a 6800RPM redline, but the rev limiter doesn't kick in until just after 7000 RPM. A ZHP or any E46 that has a flashed ECU can hit 7000 RPM in 2nd and bounce off the rev limiter at which point it would be doing 60.25 MPH with a 3.46 final drive. Check out the calculation I did over on my330i.com:

ZHP 5.6 to 60 is a little ambitious. That number is more than a half second quicker than my 330 CI AT and within .5 of my 08 G37S all while giving up nearly 100 hp to the G. These threads are interesting but wildly inaccurate, fun to discuss though. Cheers!

Your Steptronic slows the car down by at least a whole second and the only reason that it comes close to the manual time is due to it having the shorter 3.46 gearing vs. the manuals 2.93 or 3.07 in a ZHP.

You G37S is heavy and the horsepower means nothing if it isn't developed at the right points in the power curve.

ZHP 5.6 to 60 is a little ambitious. That number is more than a half second quicker than my 330 CI AT and within .5 of my 08 G37S all while giving up nearly 100 hp to the G. These threads are interesting but wildly inaccurate, fun to discuss though. Cheers!

FYI, 0-60 was done in 5.4 seconds and 1/4 mile in 14 seconds flat by KrisL, on a %100 stock ZHP... When in doubt, use the search button.

^ I am sure those issues were debated in the past without any consensus, but I think 5.6 should be consistently doable

IIRC, KrisL only got below 6 sec on 1 out of 3 attempts. I know we're all pro drivers but 5.6 is a wee bit optimistic for most people. While it's not impossible, it would certainly be easier to achieve consistently in a car with more torque that would make nailing the perfect launch a little less critical.